<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="../js/vue.js"></script>
</head>
<body>
    <!-- 
        只要data数据发生改变，就会把模版重新解析一遍，函数也会重新调用一遍
     -->
    <div id="root">
        姓：<input type="text" v-model="firstName"><br>
        名：<input type="text" v-model="lastName"><br>
        全名：<span>{{fullName()}}</span>
    </div>
    <script>
        Vue.config.productionTip = false

        new Vue({
            el:'#root',
            data:{
                firstName:"张",
                lastName:'三'
            },
            methods:{
                fullName(){
                    return this.firstName + '-' + this.lastName
                }
            }
        })
    </script>
</body>
</html>